RKC INSTRUMENT SA200 Communication Instruction Manual

Brand: RKC INSTRUMENT

Model: SA200

Category: Temperature & humidity sensors

Type: Communication Instruction Manual

IMR01D02-E3

SA200

Communication

Instruction Manual

RKC INSTRUMENT INC.

Temperature Controller



1999, RKC INSTRUMENT INC.

!"Modbus is a registered trademark of Schneider Electric.

!"Company names and product names used in this manual are the trademarks or registered trademarks of

the respective companies.

IMR01D02-E3

i-1

Thank you for purchasing the RKC instrument. In order to achieve maximum performance and ensure

proper operation of your new instrument, carefully read all the instructions in this manual. Please

place this manual in a convenient location for easy reference.

SYMBOLS

: This mark indicates important information on installation, handling and operating

procedures.

: This mark indicates supplemental information on installation, handling and

operating procedures.

: This mark indicates where additional information may be located.

An external protection device must be installed if failure of this instrument

could result in damage to the instrument, equipment or injury to personnel.

All wiring must be completed before power is turned on to prevent electric

shock, fire or damage to instrument and equipment.

This instrument must be used in accordance with the specifications to prevent

fire or damage to instrument and equipment.

This instrument is not intended for use in locations subject to flammable or

explosive gases.

Do not touch high-voltage connections such as power supply terminals, etc.

to avoid electric shock.

RKC is not responsible if this instrument is repaired, modified or

disassembled by other than factory-approved personnel. Malfunction can

occur and warranty is void under these conditions.

CAUTION

: This mark indicates precautions that must be taken if there is danger of electric

shock, fire, etc., which could result in loss of life or injury.

: This mark indicates that if these precautions and operating procedures are not

taken, damage to the instrument may result.

: This mark indicates that all precautions should be taken for safe usage.

WARNING

IMR01D02-E3

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This is a Class A instrument. In a domestic environment, this instrument may cause radio

interference, in which case the user may be required to take adequate measures.

This instrument is protected from electric shock by reinforced insulation. Provide

reinforced insulation between the wire for the input signal and the wires for instrument

power supply, source of power and loads.

Be sure to provide an appropriate surge control circuit respectively for the following:

- If input/output or signal lines within the building are longer than 30 meters.

- If input/output or signal lines leave the building, regardless the length.

This instrument is designed for installation in an enclosed instrumentation panel. All high-

voltage connections such as power supply terminals must be enclosed in the

instrumentation panel to avoid electric shock by operating personnel.

All precautions described in this manual should be taken to avoid damage to the

instrument or equipment.

All wiring must be in accordance with local codes and regulations.

All wiring must be completed before power is turned on to prevent electric shock,

instrument failure, or incorrect action.

The power must be turned off before repairing work for input break and output failure

including replacement of sensor, contactor or SSR, and all wiring must be completed

before power is turned on again.

To prevent instrument damage or failure, protect the power line and the input/output lines

from high currents with a protection device such as fuse, circuit breaker, etc.

Prevent metal fragments or lead wire scraps from falling inside instrument case to avoid

electric shock, fire or malfunction.

Tighten each terminal screw to the specified torque found in the manual to avoid electric

shock, fire or malfunction.

For proper operation of this instrument, provide adequate ventilation for heat dispensation.

Do not connect wires to unused terminals as this will interfere with proper operation of the

instrument.

Turn off the power supply before cleaning the instrument.

Do not use a volatile solvent such as paint thinner to clean the instrument. Deformation or

discoloration will occur. Use a soft, dry cloth to remove stains from the instrument.

To avoid damage to instrument display, do not rub with an abrasive material or push front

panel with a hard object.

Do not connect modular connectors to telephone line.

NOTICE

This manual assumes that the reader has a fundamental knowledge of the principles of electricity,

process control, computer technology and communications.

The figures, diagrams and numeric values used in this manual are only for purpose of illustration.

RKC is not responsible for any damage or injury that is caused as a result of using this instrument,

instrument failure or indirect damage.

Periodic maintenance is required for safe and proper operation of this instrument. Some

components have a limited service life, or characteristics that change over time.

Every effort has been made to ensure accuracy of all information contained herein. RKC makes no

warranty expressed or implied, with respect to the accuracy of the information. The information in

this manual is subject to change without prior notice.

No portion of this document may be reprinted, modified, copied, transmitted, digitized, stored,

processed or retrieved through any mechanical, electronic, optical or other means without prior

written approval from RKC.

CAUTION

IMR01D02-E3

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CONTENTS

Page

1. SPECIFICATIONS................................................................1

2. WIRING .................................................................................3

3. SETTING ...............................................................................5

3.1 Communication Setting Mode .........................................................................5

3.2 Setting the Communication Parameters..........................................................6

3.3 Device Address/Slave Address Setting ...........................................................7

3.4 Communication Speed Setting........................................................................9

3.5 Data Configuration Setting ............................................................................11

3.6 Interval Time Setting .....................................................................................13

3.7 Communication Requirements ......................................................................14

4. RKC COMMUNICATION PROTOCOL...............................17

4.1 Polling............................................................................................................17

4.1.1 Polling procedures ............................................................................................18

4.1.2 Polling procedure example ...............................................................................21

4.2 Selecting........................................................................................................22

4.2.1 Selecting procedures........................................................................................22

4.2.2 Selecting procedure example ...........................................................................25

4.3 Communication Identifier List ........................................................................26

5. MODBUS COMMUNICATION PROTOCOL ...................... 30

5.1 Message Format ...........................................................................................30

5.2 Function Code ...............................................................................................31

5.3 Communication Mode ...................................................................................31

5.4 Slave Response ............................................................................................32

5.5 Calculating CRC-16.......................................................................................33

IMR01D02-E3

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Page

5.6 Message Format ...........................................................................................35

5.6.1 Reading holding registers [03H]........................................................................35

5.6.2 Preset single resister [06H]...............................................................................36

5.6.3 Diagnostics (loopback test) [08H] .....................................................................37

5.7 Data Configuration ........................................................................................38

5.7.1 Data range........................................................................................................38

5.7.2 Data processing precautions ............................................................................39

5.8 Communication Data List ..............................................................................40

6. INPUT RANGE TABLES ....................................................44

7. TROUBLESHOOTING .......................................................48

8. ASCII 7-BIT CODE TABLE ................................................51

IMR01D02-E3

1. SPECIFICATIONS

SA200 interfaces with the host computer via Modbus or RKC communication protocols. For

reference purposes, the Modbus protocol identifies the host computer as master, the SA200 as slave.

The RKC protocol identifies these parts of the control system as the host computer and SA200.

!"!"

RKC communication

Interface: Based on RS-485, EIA standard

Connection method: 2-wire system, half-duplex multi-drop connection

Communication distance: 1 km max.

The maximum communication distance will be affected by the

surrounding conditions.

Synchronous method: Start/stop synchronous type

Communication speed: 2400 bps, 4800 bps, 9600 bps, 19200 bps

Data bit configuration: Start bit: 1

Data bit: 7 or 8

Parity bit: Without, Odd or Even

Stop bit: 1 or 2

Protocol: ANSI X3.28 subcategory 2.5, A4

Polling/selecting type

Error control: Vertical parity (With parity bit selected)

Horizontal parity (BCC check)

Communication code: ASCII 7-bit code

Termination resistor: Externally connected

Xon/Xoff control: None

Maximum connections: 32 instruments maximum including a host computer

Signal logic: RS-485

Signal voltage Logic

V (A) - V (B) ≥ 2 V 0 (SPACE)

V (A) - V (B) ≤ -2 V 1 (MARK)

Voltage between V (A) and V (B) is the voltage of (A) terminal for the

(B) terminal.

1. SPECIFICATIONS

IMR01D02-E3

!"!"

Modbus

Interface: Based on RS-485, EIA standard

Connection method: 2-wire system, half-duplex multi-drop connection

Communication distance: 1 km max.

The maximum communication distance will be affected by the

surrounding conditions.

Synchronous method: Start/stop synchronous type

Communication speed: 2400 bps, 4800 bps, 9600 bps, 19200 bps (Selectable)

Data bit configuration: Data bit: 8 (Byte data corresponding to binary data or bit.)

Parity bit: Without, Odd or Even (Selectable)

Stop bit: 1

Protocol: Modbus

Signal transmission mode: Remote Terminal Unit (RTU) mode

Function code: 03H (Read holding registers)

06H (Preset single register)

08H (Diagnostics: loopback test)

Error check method: CRC-16

Error code: 1: Function code error

2: When written to read only (RO) data, When any address other than

0000H to 001AH is specified, etc.

3: When the data written exceeds the setting range, When the specified

number of data items in the query message exceeds the maximum

number of data items available

4: Self-diagnostic error response

Termination resistor: Externally connected

Maximum connections: 32 instruments maximum including a master

Signal logic: RS-485

Signal voltage Logic

V (A) - V (B) ≥ 2 V 0 (SPACE)

V (A) - V (B) ≤ -2

1 (MARK)

Voltage between V (A) and V (B) is the voltage of (A) terminal for the

(B) terminal.

IMR01D02-E3

2. WIRING

!"!"

Terminal number and signal details

Terminal

No.

Symbol Signal

name

10 Signal ground SG

11 Send data/Receive data T/R (A)

12 Send data/Receive data T/R (B)

!"!"

Wiring method

#"#"

Connection to the RS-485 port of the host computer (master)

T/R

(

)

T/R

(

)

T/R

(

)

T/R

(

)

(

RXD

)

：

Receive data

(

TXD

)

：

Send data

Host com

uter

(

Master

)

RS-485

T/R

(

)

T/R

(

)

31 max.

Paired wire

Send/Receive

transfer signal

Shielded twisted

pair wire

SA200

(Slave)

SA200

(Slave)

SD (TXD) and RD (RXD): Negative logic

* R: Termination resistors (Example: 120

Ω

1/2 W)

* R

To prevent electric shock or instrument failure, turn off the power before

connecting or disconnecting the instrument and peripheral equipment.

WARNING

2. WIRING

IMR01D02-E3

#"#"

Connection to the RS-232C port of the host computer (master)

A RS-232C/RS-485 converter is required.

SA200

(Slave)

T/R (B)

T/R (A)

RS-485

T/R (A)

T/R (B)

RS-232C

Host computer

(

Master

)

RS-232C/RS-485

converter

Shielded twisted

pair wire

Paired wire

* R

* R: Termination resistors (Example: 120

Ω

1/2 W)

When the host computer (master) uses Windows 95/98/NT, use a RS-232C/RS-485

converter with an automatic send/receive transfer function.

Recommended: CD485, CD485/V manufactured by Data Link, Inc. or equivalent.

!"!"

Wiring example

#"#"

Connection with up to 31 SA200 (slaves) and one host computer (master)

Host computer (Master) Host computer (Master)

RS-232C/RS-485 converter

Junction terminal

30 29 31 1 2 3 4

SA200

(

Slaves

)

SA200

(

Slaves

)

Device address

(Slave address)

RS-485

RS-232C

RS-485

IMR01D02-E3

3. SETTING

To establish communication parameters between host computer (master) and SA200 (slave), it is

necessary to set the device address (slave address), communication speed, data configuration and

interval time on each SA200 (slave) in the communication mode.

3.1 Communication Setting Mode

1. When the power to the SA200 is turned on, the input type, input range and PV/SV display will

be automatically displayed in that order.

2. To go to the communication setting mode, you must be in PV/SV display. Press and hold the

SET key and press the <R/S key at the same time to initiate communication settings. The first

parameter to be displayed will be the device address (slave address), Add.

R/SSET

SA200

SVPV

OUT2

OUT1

ALM2

SV2

ALM1

PV/SV display

R/SSET

SA200

SVPV

OUT2

OUT1

ALM2

SV2

ALM1

Device address (Slave address)

Communication setting mode

To return to the PV/SV display, press and hold the SET key and press the <R/S key at the

same time.

3. SETTING

IMR01D02-E3

3.2 Setting the Communication Parameters

To select parameters in communication setting mode, press the SET key. The parameters are

displayed and sequenced in the order of device address (slave address), Add, communication speed,

bPS, data configuration, bIT and interval time set value, InT.

!"!"

Display flowchart

Input type and input range

display

Power ON

(Display approx. 4 seconds.)

Display changes automatically

PV/SV display

Device address

(Slave address)

[

Add

]

Communication

speed

[

bPS

]

Data configuration

[

bIT

]

Interval time set value

[

InT

]

Press the SET key.

Communication setting mode

SVPV

Press the SET key

for 2 seconds.

Parameter

setting mode

Press and hold the SET key and press the <R/S key at same time.

3. SETTING

IMR01D02-E3

3.3 Device Address (Slave Address) Setting

The device address (slave address) must be set before communication can begin. The device address

(slave address) number is set with numbers from 0 to 99.

Symbol Name Setting range Description Factory

set value

Device address

(Slave address)

0 to 99 Set the SA200 device

address (slave address).

Add

If the slave address is set to 0 in Modbus communication, two-way communication cannot

be performed.

When the communication parameter is changed, turn the power on and off again or switch

from STOP to RUN to refresh and make the new value effective. If neither action is taken,

the SA200 will maintain the set value prior to change.

All device address (slave address) settings must be stored by pressing the SET key. If

changes are made and the SET key is not pressed within one minute, the display will

automatically return to the PV/SV display and the device address (slave address) will return

to the value prior to set change.

!"!"

Setting procedure

Example: When setting the device address (slave address) to 15.

1. Go to the communication setting mode so that device address (slave address), Add, is displayed.

See

3.1 Communication Setting Mode (P. 5),

3.2 Select Communication Parameters

(P. 6).

R/SSET

SA200

SVPV

OUT2

OUT1

ALM2

SV2

ALM1

Device address (Slave address)

Continued on the next page.

3. SETTING

IMR01D02-E3

2. Press the UP key to enter 5 at the first digit from the right.

R/SSET

SA200

SVPV

OUT2

OUT1

ALM2

SV2

ALM1

3. Press the <R/S key to blink the second digit from the right.

R/SSET

SA200

SVPV

OUT2

OUT1

ALM2

SV2

ALM1

4. Press the UP key to enter 1 at the second digit from the right.

R/SSET

SA200

SVPV

OUT2

OUT1

ALM2

SV2

ALM1

5. Press the SET key to store the new device address (slave address). The display automatically

goes to the next communication parameter, bPS.

3. SETTING

IMR01D02-E3

3.4 Communication Speed Setting

The communication speed of 2400 bps, 4800 bps, 9600 bps or 19200 bps is selectable. To select the

speed of the bPS setting, press the UP or DOWN key.

Symbol Name Setting range Description Factory

set value

Communication

speed

240: 2400 bps

480: 4800 bps

960: 9600 bps

Select the communication

speed

960

bPS 1920: 19200 bps

Set the same communication speed for both the SA200 (slave) and the host computer

(master).

When the communication parameter is changed, turn the power on and off again or switch

from STOP to RUN to refresh and make the new value effective. If neither action is taken,

the SA200 will maintain the set value prior to change.

All communication speed settings must be stored by pressing the SET key. If changes are

made and the SET key is not pressed within one minute, the display will automatically

return to the PV/SV display and the communication speed will return to the value prior to

set change.

!"!"

Setting procedure

Example: Setting communication speed 480: 4800 bps.

1. Go to the communication setting mode so that slave address, Add, is displayed. Then, press the

SET key once, so the communication speed symbol, bPS, appears.

See

3.1 Communication Setting Mode (P. 5),

3.2 Select Communication Parameters

(P. 6).

Communication speed

R/SSET

SA200

SVPV

OUT2

OUT1

ALM2

SV2

ALM1

Continued on the next page.

3. SETTING

IMR01D02-E3

2. Press the DOWN key to set 480.

R/SSET

SA200

SVPV

OUT2

OUT1

ALM2

SV2

ALM1

3. Press the SET key to store the new communication speed. The display automatically goes to the

next communication parameter, bIT.

3. SETTING

IMR01D02-E3

3.5 Data Configuration Setting

To select the data configuration setting, press the UP or DOWN key.

Symbol Name Setting range Description Factory

set value

Data configuration See

Data

configuration

Select data configuration

during communication

8n1

bIT table.

Data configuration table

Setting Data bit Parity bit Stop bit

(7n1) 7 Without 1

(7n2) 7 Without 2

(7E1) 7 Even 1

(7E2) 7 Even 2

(7o1) 7 Odd 1

(7o2) 7 Odd 2

(8n1) 8 Without 1

(8n2) 8 Without 2

(8E1) 8 Even 1

(8E2) 8 Even 2

(8o1) 8 Odd 1

(8o2) 8 Odd 2

Set the same data configuration for both the SA200 (slave) and the host computer (master).

When the communication parameter is changed, turn the power on and off again or switch

from STOP to RUN to refresh and make the new value effective. If neither action is taken,

the SA200 will maintain the set value prior to change.

All data configuration settings must be stored by pressing the SET key. If changes are made

and the SET key is not pressed within one minute, the display will automatically return to

the PV/SV display and the data configuration will return to the value prior to set change.

Setting range of

RKC

communication

Setting range of

Modbus

3. SETTING

IMR01D02-E3

!"!"

Setting procedure

The setting procedures are the same as communication speed setting.

1. Go to the communication setting mode so that slave address, Add, is displayed. Press the SET

key until the data configuration symbol, bIT, appears.

2. Set the data bit configuration by pressing the UP or DOWN key.

For details on setting procedure, see 3.4 Communication Speed Setting (P. 9).

3. SETTING

IMR01D02-E3

3.6 Interval Time Setting

The interval time is set with numbers from 0 to 250 ms. To shift the digit, press the <R/S key. To

change the number of the digit, press the UP or DOWN key.

Symbol Name Setting range Description Factory

set value

Interval time set

value

0 to 250 ms Set the value to set the

interval time

InT

When the communication parameter is changed, turn the power on and off again or switch

from STOP to RUN to refresh and make the new value effective. If neither action is taken,

the SA200 will maintain the set value prior to change.

All interval times must be stored by pressing the SET key. If changes are made and the SET

key is not pressed within one minute, the display will automatically return to the PV/SV

display and the interval time will return to the value prior to set change.

!"!"

Setting procedure

The setting procedures are the same as device address (slave address) setting.

1. Go to the communication setting mode so that slave address, Add, is displayed. Press the SET

key until the interval time symbol, InT, appears.

2. Set the interval time by pressing the UP or DOWN key.

For details on setting procedure, see 3.3 Device Address (Slave Address) Setting (P. 7).

3. SETTING

IMR01D02-E3

3.7 Communication Requirements

!"!"

Processing times during data send/receive

The SA200 requires the following processing times during data send/receive.

Whether the host computer is using either the polling or selecting procedure for communication, the

following processing times are required for SA200 to send data:

-Response wait time after SA200 sends BCC in polling procedure

-Response wait time after SA200 sends ACK or NAK in selecting procedure

RKC communication (Polling procedure)

Procedure details Time (ms)

MIN TYP MAX

Response send time after SA200 receives ENQ 1.6 4.0 12

Response send time after SA200 receives ACK 1.6

−

Response send time after SA200 receives NAK 1.6

−

Response send time after SA200 sends BCC

−−

1.0

RKC communication (Selecting procedure)

Procedure details Time (ms)

MIN TYP MAX

Response send time after SA200 receives BCC 1.6 3.0 10

Response wait time after SA200 sends ACK

−−

1.0*

Response wait time after SA200 sends NAK

−−

1.0*

Modbus

Procedure details Time (ms)

Read holding registers [03H]

Response transmission time after the slave receives the query

message

13 ms max.

Preset single register [06H]

Response transmission time after the slave receives the query

message

6 ms max.

Diagnostics (loopback test) [08H]

Response transmission time after the slave receives the query

message

6 ms max.

Response send time is time at having set interval time in 0 ms.

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RKC INSTRUMENT SA200 Communication Instruction Manual

Brand: RKC INSTRUMENT

Model: SA200

Category: Temperature & humidity sensors

Type: Communication Instruction Manual

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RKC INSTRUMENT SA200 Communication Instruction Manual

RKC INSTRUMENT SA200 Communication Instruction Manual

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